Hi and Welcome,
Firstly your Iberosat HD4500 STB is not a Freesat box.
You can only receive Freesat on a Freesat box, and so you do not have a "Freesat Sytsem" installed, otherwise your box would be a Freesat box!
You have a "generic" box, that can receive the same FTA channels as a Freesat box (or a Sky box with no card!).
and so your contact in the uK are correct in that there are no sync issues with Freesat...as you are not using Freesat!
If you are experiencing the issues on the "free to air" channels like SKy News and True Movies and CBS, then it will more than likely be an issue with the receiver.
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